Nano/Microstructure Fabrication of Functional Organic Material: Polymorphic Structure and Tunable Luminescence

Abstract

Nano/microstructure fabrication of 2-cyano-3(4-(diphenylamino)phenyl) acrylic acid (CDPA), an organic optoelectronic material, via a simple reprecipitation method produces particles with a different morphology, phase, and structure and a tailored luminescence. Spherical amorphous, diamond, and multifaceted microcrystals of CDPA were obtained by optimizing the fabrication conditions. CDPA with rod-like morphology was produced on the introduction of polymer additives to the growth solution. A polymorph of CDPA, not observed in the usual solution crystallization process, was obtained as 1D nanowires (200-400 nm (width) and 3-20 µm (length)). Powder X-ray diffraction and optical studies demonstrate the polymorphic structure of the nanowires. Scanning electron and confocal fluorescence microscopy, respectively, were used to demonstrate the different morphologies of fabricated nano/microstructures and the luminescence tuning (from 604 to 519 nm).

Morphology directing synthesis of 1-aminopyrene microstructures and its super quenching effect towards nitro aromatics

“…Organic nano/ micro particles are synthesized either top-down or bottom-up approach. Various techniques were developed to prepare organic nano/micro particles, such as reprecipitation [29], physical vapour deposition [30], microemulsion [31], ultra-sonication [32], template method [33], self-organization [34] etc.…”

“…Driving forces for self assembly are based on different intermolecular forces like van der Waals interaction [17], hydrogen bonding [18], co-ordination bonding, hydrophobic interaction [19], π-π stacking [20] etc. The impact of various intermolecular interactions can be realized as the crystal evolves from a nanoscopic size domain to a microcrystalline and bulk solid.…”

Synthesis, crystal structures, and two-photon absorption of a series of cyanoacetic acid triphenylamine derivatives

“…So the family of triphenylamine derivatives was widespread use as hole transporting materials, emitting layers in electroluminescent diodes, light harvesters in dye-sensitized solar cells, and nonlinear optical materials during the past few decades [14]; (2) The ethoxyl segment, compared to a phenyl group, has much more steric hindrance and hence might avoid p-p stack between the molecules and more powerfully prevent unfavorable chromophore aggregation. Additionally, Marder's group reported that the 4-[bis(4-me thoxyphenyl)amino]phenyl moiety had been confirmed to be more readily ionized and higher donor strength using density functional theory calculations [15]; (3) It has been found that introduction of a carboxylic or cyanoacrylic acid as an acceptor in triphenylamine may lead well to improve the efficiency of the UV/vis photo-induced intramolecular charge transfer (ICT).…”

A novel scheme to obtain tunable fluorescent colors based on electrospun composite nanofibers

“…Currently, the most common color-tunable luminescent materials were prepared by introducing inorganic phosphors [4], semiconductor quantum dots [5], functional organic materials [6] and rare earth (RE) organic complexes [7], etc.…”

“…Wang et al [10] prepared colortunable and white-light emitting lanthanide complexes, and demonstrated the energy transfer mechanism was involved. Liu et al [11] fabricated nano/micro-scaled Eu 3+ and Tb 3+ co-doped La(1,3,5-BTC) (H 2 O) 6 …”